xxni THE CHURCH OF S, SAVIOUR IN THE CHORA 313
in with arcades in two stories forming an aisle and gallery.
This is the normal domed * basilica construction. Here, if we regard the floor of the upper passage (B on plan, p. 318) as the remains of the old gallery floor,—and no other view
FIG. 101.—S, SOPHIA, SALONICA.
seems to account for its existence,—the internal elevation was in three stories, an aisle at the ground level, above it a gallery, and above that, in the arch tympanum, a triple window. Such an arrangement is, so far as we know, unique in a small church, but it is the arrangement used in S. Sophia, Constantinople, and may well have been derived